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  <title>index 首页</title>
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<body>
  <a href="./a.html">page a</a>
  <a href="./b.html">page b</a>
  <a href="#a">a</a>
  <div style="height: 200px;background:#666;">1</div>
  <div style="height: 200px;background:#333;">2</div>
  <div style="height: 200px;background:#666;">3</div>
  <div style="height: 200px;background:#333;">4</div>
  <div style="height: 200px;background:#666;">5</div>
  <div style="height: 200px;background:#333;">6</div>
  <div id="a" style="height: 200px;background:#666;">this a</div>
 
  <div style="height: 200px;background:#333;">11111111</div>
  <div style="height: 200px;background:#666;">2222222</div>
  <div style="height: 200px;background:#333;">3333</div>
  <div style="height: 200px;background:#666;">44444444</div>
  <div style="height: 200px;background:#333;">555555555</div>
  <div style="height: 200px;background:#666;">66666666</div>
</body>
</html>